If F is the pull applied at the ends of tape in kg, l is the length of tape between end marks in metres, w is the weight of the tape in kg per metre run, then sag correction

• A. <img src="/_files/images/civil-engineering/surveying/76-3.347-1.png">
• B. <img src="/_files/images/civil-engineering/surveying/76-3.347-2.png">
• C. <img src="/_files/images/civil-engineering/surveying/76-3.347-3.png">
• D. <img src="/_files/images/civil-engineering/surveying/76-3.347-4.png">
• E. .